I remember reading this here the other day I think, and it was at a 1MB blocksize rate.... I would guess that in 4 years maybe the blockchain has been increased, at least doubled.

Anyway, let's imagine it doesnt, and we stay at 1MB.... what do you think the price for 700GB will be in 4 years? If things don't change much, it means running a node will take almost an entire HD (let's say the usual HD size is 1TB).

What happens once the size goes beyond 1TB, or beyond the biggest HD? what happens when you can't fit the blocksize in a regular HDs? Can you run 3/4 of the blockchain then the remaining 1/4 part in another HD?